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2,150 Articles
6,290 Members
112 Directory Listings
132,318 Followers

The world's best gem articles, published weekly.

Most Recent Articles

Rhodochrosite Value, Price, and Jewelry Information

Beautiful rose red to pink rhodochrosite crystals are popular with mineral collectors. Although very soft, opaque material has been fashioned into beads, cabochons, and carvings, while very rare translucent to transparent material has been cut into faceted gems.

Gemology Cheat Sheets

These gemology cheat sheets review gem color and clarity grading, specific information on evaluating diamonds and opals, and basic gem identification tests.

Should You do Gemstone Repair Work?

Novice faceters need to build beneficial business relationships with jewelers. To do this, learn how to manage gemstone repair work (and when to say no).

Emerald Buying Guide

Our emerald buying guide can help you learn how these gems are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.

Gemstone Identification Quizzes: Testing Procedures

Gemstone identification can involve many tests. These quizzes can help novice gemologists learn to pick the appropriate ones and identify gems efficiently.

Buying Gems: Test Your Identification Skills

When buying gems, gemologists must temper their excitement with an analytical eye. Test your gem identification skills with these quizzes.

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

The world's best online resource for gemstone appraisal

Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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